Millimeter-wave Aperture Synthesis Imaging of Vega: Evidence for a Ring Arc at 95 AU

Details Millimeter-wave Aperture Synthesis Imaging of Vega: Evidence for a Ring Arc at 95 AU Millimeter-wave Aperture Synthesis Imaging of Vega: Evidence for a Ring Arc at 95 AU

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.6605k&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #66.05; Bulletin of the American Astronomical Society, Vol. 33, p.1410

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first millimeter-wave aperture synthesis map of dust around a main sequence star. A 3'' resolution image of 1.3 mm continuum emission from Vega reveals a clump of emission 12'' from the star at PA 45o, consistent with the location of maximum 850 μ m emission in a lower resolution JCMT/SCUBA map. The flux density is 4.0+/-0.9 mJy. Adjacent 1.3 mm peaks with flux densities 3.4+/-1.0 mJy and 2.8+/-0.9 mJy are located 14'' and 13'' from the star at PA 67o and 18o, respectively. An arc-like bridge connects the two strongest peaks. There is an additional 2.4 +/-0.8 mJy peak to the SW 11'' from the star at PA 215o and a marginal detection, 1.4+/-0.5 mJy, at the stellar position, consistent with photospheric emission. An extrapolation from the 850 μ m flux, assuming F1.3mm-0.85mm λ -2.8, agrees well with the total detected flux for Vega at 1.3 mm, and implies a dust emissivity index, β , of 0.8 We conclude that we have detected all but a very small fraction of the dust imaged by SCUBA in our aperture synthesis map and that these grains are largely confined to segments of a ring of radius 95 AU.

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